Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 9.25% Senior Notes due 2020 [Member]		Dec. 31, 2012 9.25% Senior Notes due 2020 [Member]		Jul. 30, 2012 9.25% Senior Notes due 2020 [Member]	Dec. 31, 2013 Senior Secured Revolving Credit Facility [Member]	Dec. 31, 2012 Senior Secured Revolving Credit Facility [Member]	Dec. 31, 2013 Letters Of Credit [Member]		Dec. 31, 2012 Letters Of Credit [Member]		Dec. 31, 2013 2006 Gulf Coast Acquisition [Member]	Dec. 31, 2006 2006 Gulf Coast Acquisition [Member]
Debt Instrument [Line Items]
Credit Agreement, amount outstanding								$ 615,000,000	$ 470,000,000	$ 23,488,000	[1]	$ 23,488,000	[1]
Long-term debt			296,593,000	[2]	296,076,000	[2]
Total long-term debt	911,593,000	766,076,000
Stated interest rate							9.25%
Long-term debt unamortized discount			3,400,000		3,900,000
Issued letter of credit in addition to escrow														$ 23,500,000	$ 3,000,000

[1] These letters of credit relate to a reclamation deposit requirement. Refer to Note 11 - Commitments and Contingencies for details.

[2] The amount is net of unamortized discount of $3.4 and $3.9 million as of December 31, 2013 and 2012, respectively.